SeaweedFS: Path traversal in the S3 and Iceberg REST gateways allows cross-bucket access (CVE-2026-54917)
SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the S3 API gateway and the Iceberg REST catalog gateway construct their routers with mux.NewRouter().SkipClean(true). With path cleaning disabled, a .. segment inside the URL survives routing, so a request such as `GET /bucket-A/../evil-bucket/key`, is matched as bucket=bucket-A, object=../evil-bucket/key. The captured object key is then joined into a filer path with util.JoinPath (S3) / path.Join (Iceberg), which collapse the .. server-side, so the actual read or write lands in evil-bucket. This vulnerability is fixed in 4.30.
AI Analysis
Technical Summary
SeaweedFS is a distributed storage system supporting S3 and Iceberg APIs. Before version 4.30, the S3 API gateway and Iceberg REST catalog gateway use mux.NewRouter().SkipClean(true), disabling path cleaning. This allows '..' segments in URLs to persist through routing, causing the system to interpret paths like '/bucket-A/../evil-bucket/key' as accessing 'evil-bucket' instead of 'bucket-A'. The object key is joined server-side with path joining functions that collapse '..', resulting in cross-bucket read or write access. This is a path traversal vulnerability (CWE-22) fixed in version 4.30.
Potential Impact
An attacker can exploit this vulnerability to access or modify objects in buckets other than the one specified in the URL, potentially leading to unauthorized data access or data manipulation across buckets within the SeaweedFS storage system.
Mitigation Recommendations
Upgrade SeaweedFS to version 4.30 or later, where this path traversal vulnerability is fixed. No other mitigation is necessary as the fix is official and available.
SeaweedFS: Path traversal in the S3 and Iceberg REST gateways allows cross-bucket access (CVE-2026-54917)
Description
SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the S3 API gateway and the Iceberg REST catalog gateway construct their routers with mux.NewRouter().SkipClean(true). With path cleaning disabled, a .. segment inside the URL survives routing, so a request such as `GET /bucket-A/../evil-bucket/key`, is matched as bucket=bucket-A, object=../evil-bucket/key. The captured object key is then joined into a filer path with util.JoinPath (S3) / path.Join (Iceberg), which collapse the .. server-side, so the actual read or write lands in evil-bucket. This vulnerability is fixed in 4.30.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
SeaweedFS is a distributed storage system supporting S3 and Iceberg APIs. Before version 4.30, the S3 API gateway and Iceberg REST catalog gateway use mux.NewRouter().SkipClean(true), disabling path cleaning. This allows '..' segments in URLs to persist through routing, causing the system to interpret paths like '/bucket-A/../evil-bucket/key' as accessing 'evil-bucket' instead of 'bucket-A'. The object key is joined server-side with path joining functions that collapse '..', resulting in cross-bucket read or write access. This is a path traversal vulnerability (CWE-22) fixed in version 4.30.
Potential Impact
An attacker can exploit this vulnerability to access or modify objects in buckets other than the one specified in the URL, potentially leading to unauthorized data access or data manipulation across buckets within the SeaweedFS storage system.
Mitigation Recommendations
Upgrade SeaweedFS to version 4.30 or later, where this path traversal vulnerability is fixed. No other mitigation is necessary as the fix is official and available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-w62w-66v9-vvgv
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-54917"]
- Ecosystems
- ["Go"]
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a7cd3debf8831d53917fb36
Added to database: 08/12/2026, 20:13:18 UTC
Last enriched: 09/08/2026, 15:10:43 UTC
Last updated: 09/25/2026, 13:47:46 UTC
Views: 26
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